Lamp



FIG. 1 is a perspective view of a lamp embodying the design of the present invention.

FIG. 2 is a front side elevational view of the lamp illustrated in FIG. 1, the back side elevational view, left side elevational view and right side elevational view being identical thereto.

FIG. 3 is a top view of the lamp of FIG. 1; and,

FIG. 4 is a bottom view of the lamp of FIG. 1.

The lamp shade shown in broken lines does not form a part of the claimed design. 

The ornamental design for a lamp, substantially as shown and described. 